Cause Remedy
This message may be
displayed when driving
under severe operating
conditions. (For exam-
ple, when driving up a
long steep hill.)
5 Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
6 After stopping the hybrid system and waiting for 5
minutes or more, start the hybrid system again and
check for the multi-information display.
If the message does not disappear: Stop the hybrid sys-
tem and contact any authorized Lexus retailer or Lexus
authorized repairer, or any reliable repairer.
If the message is not displayed: The hybrid system tem-
perature has dropped and the vehicle may be driven
normally.
However, if the message appears again frequently, con-
tact any authorized Lexus retailer or Lexus authorized
repairer, or any reliable repairer.
WARNING
When opening the hood, observe the following precautions.
● If steam is seen coming from under the hood, do not open the hood until the steam has
subsided. The engine compartment may be very hot.
● After turning the hybrid system off, check that the "READY" indicator is off.
When the hybrid system is operating, the gasoline engine may automatically start, or
the cooling fan may suddenly operate even if the gasoline engine is stopped.
Also, it may operate for several minutes even after the power switch is turned off.
Do not touch or approach rotating parts such as the fan, which may lead to fingers or
clothing (especially a tie, a scarf or a muffler) getting caught, resulting in serious injury.
● Do not loosen the coolant reservoir cap while the hybrid system and radiator are hot.
High temperature steam or coolant could spray out.
NOTICE
■ When adding engine/power control unit coolant
Add coolant slowly after the hybrid system has cooled down sufficiently.
9-2. If a warning light illuminates/flashes or a warning message is displayed on the meter
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